Transformer-Coupled Tunable Attenuator for Low-Noise Temperature Compensation

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Solution Overview

Problem

Existing attenuators in radar transceivers suffer from degradation of uncorrelated noise and increased signal-to-noise ratio (SNR) degradation due to temperature compensation, which is not effectively addressed by current technologies.

Innovation Solution

A tunable attenuator comprising transformer windings, conductive loops underneath the windings, and a controller to manage current through the loops, utilizing a MOS switch and voltage control circuit to achieve tunable attenuation with minimal impact on uncorrelated noise, and no additional hardware resources.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If temperature compensation is implemented using existing attenuator technologies, then gain stability over temperature is improved, but uncorrelated noise is degraded and signal-to-noise ratio deteriorates

Engineering Contradiction:

Improvegain stabilityVSAvoiduncorrelated noise

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent replaces traditional resistive attenuator mechanisms with a transformer-based solution. The transformer uses magnetic coupling between primary and secondary windings to achieve attenuation without the resistive losses that generate uncorrelated noise. The controller adjusts the coupling between windings to provide temperature compensation while maintaining low noise performance.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the operating parameters of the transformer by varying the coupling coefficient between primary and secondary windings. The controller adjusts this coupling parameter in response to temperature changes, enabling gain stability without introducing significant noise. This parameter adjustment allows the system to maintain optimal performance across temperature variations.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If traditional attenuators are used for temperature compensation, then gain calibration is facilitated, but device complexity and hardware resources increase

Engineering Contradiction:

Improvetemperature compensation capabilityVSAvoidhardware resources

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The transformer structure serves multiple functions simultaneously: it provides signal transformation, temperature compensation, and gain calibration. By integrating these functions into a single component rather than using separate attenuators and control circuits, the patent reduces overall device complexity while maintaining adaptability for temperature compensation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The patent merges the attenuator function with the transformer structure. Instead of adding a separate attenuator component to existing circuitry, the temperature compensation capability is integrated directly into the transformer's operation through controlled coupling between windings, thereby reducing hardware resources.

Inventive Principle:

Principle #5Merging (Combining)

3Adaptability or versatility

If resistive attenuators are used for gain compensation, then output power calibration is facilitated, but energy loss increases

Engineering Contradiction:

Improveoutput power calibrationVSAvoidenergy loss

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The patent substitutes resistive attenuation with transformer-based magnetic coupling for output power calibration. The transformer transfers energy magnetically between windings with minimal resistive losses, enabling precise output power control while maintaining high energy efficiency. This eliminates the significant energy dissipation inherent in resistive attenuator designs.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution provides reliable temperature compensation with reduced uncorrelated noise and no significant hardware cost, maintaining a flat gain and output power over temperature variations.

Implementation Method 1

one or more transformer windings configured to facilitate attenuating a signal

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

one or more conductive loops provided underneath the transforming windings; a controller configured to control an amount of current flowing through the conductive loops, thereby providing a tunable attenuation of said signal

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentUS20240056057A1Tunable attenuator

Publication Date: 2024.02.15 BV NXP BV

AI summary

In accordance with a first aspect of the present disclosure, a tunable attenuator is provided, comprising: one or more transformer windings configured to facilitate attenuating a signal; one or more conductive loops provided underneath the transforming windings; a controller configured to control an amount of current flowing through the conductive loops, thereby providing a tunable attenuation of said signal. In accordance with a second aspect of the present disclosure, a corresponding method of producing a tunable attenuator is conceived.